Comparison of Nickel 600 and ASTM HP grade steel
Comparison of Nickel 600 and ASTM HP grade UNS N08705 steel
Nickel Alloy 600 is a high-nickel alloy renowned for its excellent high-temperature strength and corrosion resistance; while ASTM HP grade steel (N08705) is a high-chromium-nickel cast stainless steel designed for applications requiring high corrosion resistance and heat resistance. Nickel Alloy 600 exhibits excellent resistance to carburization and is a nickel-chromium-iron alloy; while N08705 is an iron-based alloy with a chromium content exceeding 25% and a nickel content exceeding 35%, making it a special high-performance stainless steel.
What are the characteristics of Inconel 600?
Inconel 600 is non-magnetic, possesses excellent mechanical properties, combines high strength with good machinability, and is easy to weld. The 600 alloy exhibits cold-forming characteristics generally similar to chromium-nickel stainless steel.
ASTM HP grade steel is an austenitic stainless steel used for casting. The listed performance parameters apply to the raw state without tempering or treatment. HP is the ASTM designation for this material, N08705 is its UNS designation, and 26Cr-35Ni is its commonly used industry name. Among cast austenitic stainless steels, HP grade steel has a relatively low thermal conductivity. Furthermore, it has poor ductility and a higher base cost.
Nickel Alloy 600, also sold under the brand name Inconel 600. It is a unique nickel-chromium alloy that is known for its oxidation resistance at higher temperatures. It is highly versatile and can be used in everything from cryogenics to applications that present elevated temperatures up to 2000°F (1093°C).
Chemical Composition Comparison: Nickel 600 vs ASTM HP UNS N08705 Steel
| Element | Nickel 600 (UNS N06600) | ASTM HP UNS N08705 Steel (Super Duplex / High Performance) |
|---|---|---|
| Nickel (Ni) | ≥ 72.0 % | 24.0 – 26.0 % |
| Chromium (Cr) | 14.00 – 17.00 % | 25.0 – 27.0 % |
| Iron (Fe) | 6.00 – 10.00 % | Balance |
| Manganese (Mn) | ≤ 1.00 % | ≤ 1.00 % |
| Silicon (Si) | ≤ 0.50 % | ≤ 0.50 % |
| Carbon (C) | ≤ 0.15 % | ≤ 0.03 % |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.015 % |
| Phosphorus (P) | – | ≤ 0.030 % |
| Copper (Cu) | ≤ 0.50 % | 1.50 – 2.50 % |
| Molybdenum (Mo) | – | 4.5 – 5.5 % |
| Nitrogen (N) | – | 0.20 – 0.30 % |
| Aluminum (Al) | ≤ 0.30 % (typical) | – |
| Titanium (Ti) | ≤ 0.30 % (typical) | – |
| Cobalt (Co) | – | – |
| Tungsten (W) | – | – |
| Vanadium (V) | – | – |
| Other Elements | ≤ 0.30 % | – |
Physical Properties Comparison: Nickel 600 vs ASTM HP UNS N08705 Steel
| Property | Nickel 600 (UNS N06600) | ASTM HP UNS N08705 Steel (Super Duplex / High Performance) |
|---|---|---|
| Density | 8.47 g/cm³ | 7.80 – 7.90 g/cm³ |
| Melting Range | 1354 – 1413 °C | 1350 – 1400 °C |
| Thermal Conductivity (20°C) | 14.8 W/m·K | 13 – 15 W/m·K |
| Specific Heat Capacity (20°C) | 460 J/kg·K | 450 – 480 J/kg·K |
| Coefficient of Thermal Expansion (20–100°C) | 13.3 μm/m·°C | 13.0 – 13.5 μm/m·°C |
| Modulus of Elasticity | 207 GPa | 195 – 200 GPa |
| Magnetic Permeability (Annealed) | Slightly magnetic (1.01 – 1.10 μ) | Ferromagnetic (austenitic-ferritic duplex structure) |
| Electrical Resistivity (20°C) | 1.03 μΩ·m | 0.85 – 1.00 μΩ·m |
| Poisson's Ratio | 0.29 | 0.29 |
| Hardness (Annealed) | 65 – 90 HRB | 250 – 290 HB (annealed/softened) |
| Maximum Recommended Service Temperature (Continuous) | ≈ 1095 °C | ≈ 300 °C (to avoid embrittlement) |
| Thermal Diffusivity (20°C) | 3.8 mm²/s | ≈ 3.5 – 4.0 mm²/s |
| Thermal Expansion (20–400°C) | 14.5 μm/m·°C | 14.0 – 14.5 μm/m·°C |
| Specific Gravity | 8.47 | 7.85 |
| Magnetic Response | Weakly magnetic | Strongly magnetic (due to ferritic phase) |
| Feature | Nickel Alloy 600 (UNS N06600) | ASTM Grade HP Stainless Steel (UNS N08705) |
|---|---|---|
| Alloy Type | Nickel-chromium-iron alloy | Cast stainless steel (a high-performance iron alloy) |
| Key Elements | High nickel content | High chromium and nickel content |
| Temperature Resistance | Excellent resistance up to 2000°F (1093°C) | Designed for high-temperature and corrosion resistance |
| Corrosion Resistance | Resistant to a wide range of corrosive conditions, especially neutral and alkaline salt solutions and sulphur compounds | Highly resistant to corrosion and scaling in high-temperature furnace applications |
| Processing | Can be difficult to process due to its hardness | Also a high-performance alloy, processing difficulty depends on the specific form and grade |
| Common Applications | Chemical processing, furnaces, and heat treating | High-temperature furnace parts, heat exchangers |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!
Gnee Steel is a supplier of Nickel 600 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Nickel 600 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Nickel 600, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
